CN215492692U - High-temperature extraction method ammonia escape on-line monitoring system - Google Patents
High-temperature extraction method ammonia escape on-line monitoring system Download PDFInfo
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- CN215492692U CN215492692U CN202120834145.7U CN202120834145U CN215492692U CN 215492692 U CN215492692 U CN 215492692U CN 202120834145 U CN202120834145 U CN 202120834145U CN 215492692 U CN215492692 U CN 215492692U
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Abstract
The utility model discloses an ammonia escape online monitoring system by a high-temperature extraction method, and relates to the technical field of monitoring systems. The utility model comprises a system cabinet, wherein the system cabinet is provided with an upper layer structure and a lower layer structure. According to the utility model, the high-temperature pretreatment unit is arranged on the upper layer structure of the system cabinet, the high-temperature pretreatment unit adopts a high-temperature extraction hot wet method to extract, sample and measure the sample gas in the chimney, the whole pipeline of the whole sample gas extraction high-temperature pretreatment unit is controlled at 180-210 ℃, the analysis and measurement of components at the same working condition temperature are ensured, the pipeline blockage caused by ammonium salt crystallization is avoided, the sampling is carried out through a jet pump, the problem of high-temperature down-sampling is solved, the sampler adopts a titanium alloy metal filter, the sampler is high-temperature resistant and corrosion resistant, the system cabinet is provided with two-stage filtration, the cleanness of the measured sample gas is ensured, the lower layer structure is provided with a calibration unit and a back-flushing gas circuit unit, and the ammonia gas analysis unit can be calibrated and checked at regular time.
Description
Technical Field
The utility model belongs to the technical field of monitoring systems, and particularly relates to an ammonia escape online monitoring system adopting a high-temperature extraction method.
Background
Along with the rapid development of economy, the call for domestic denitration improvement is increased in recent years, Selective Catalytic Reduction (SCR) and non-selective catalytic reduction (SNCR) are mostly adopted in the current domestic denitration process of flue gas of coal-fired boilers and industrial furnaces, and NHX-based reducing agents such as ammonia and urea are adopted in the denitration process; the ammonia and the nitrogen oxides react under the action of a catalyst to generate nitrogen and water. In the flue gas denitration process, the injection amount of ammonia is required to ensure that enough NH3 reacts with NOX so as to reduce the discharge amount of NOX, and excessive NH3 is required to be prevented from being injected into the flue gas; excess ammonia injection not only increases corrosion of the equipment, but also produces ammonium salts. The reaction of NH3, H2O and SO3 in the flue gas generates ammonium salt, Ammonium Bisulfate (ABS), and liquid suspended particles are easily formed on the surface of equipment. When the temperature of ABS is reduced, the ABS can absorb the moisture in the smoke to form a corrosive solution; on the surface of the catalyst with lower temperature, ABS in the flue gas can block the catalyst, so that the catalyst is deactivated, and the pressure loss of the reactor is increased. When passing through subsequent equipment, the air preheater can generate deposition on the heat exchange surface of the air preheater with lower temperature, thereby increasing the pressure drop, reducing the efficiency of the air preheater and generating blockage and corrosion on the subsequent equipment. Therefore, in the denitration reaction process, the ammonia adding amount is strictly controlled and the trace ammonia escape in the flue gas is monitored, so that the on-line monitoring of the ammonia escape is promoted.
Most of ammonia escape on-line measuring instruments in the current market are installed in an in-situ correlation mode for measurement, a laser emitting unit is installed on one section of the smoke stack or the smoke flue opposite to the two sides, a laser receiving unit is installed on the opposite side, and ammonia concentration is measured through absorption of ammonia on a spectrum.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an online monitoring system for ammonia escape by a high-temperature extraction method, which solves the existing problems that the installation difficulty is high, the field working condition cannot ensure that a transmitting unit and a receiving unit are on the same horizontal line, the instrument cannot normally measure due to slight deviation, and the working condition of high content of particulate matters in a chimney can cause serious deviation of measured data.
In order to achieve the purpose, the utility model is realized by the following technical scheme:
an ammonia escape online monitoring system adopting a high-temperature extraction method comprises a system cabinet, wherein the system cabinet is provided with an upper layer structure and a lower layer structure;
the upper layer structure is internally provided with a high-temperature pretreatment unit, the high-temperature pretreatment unit is internally provided with a high-temperature electric ball valve, a jet pump, a high-temperature filter, a heating unit and a temperature sensor, and the lower layer structure comprises a calibration unit, a back-flushing gas circuit unit, an electric control unit, an analysis unit and a refrigeration unit.
Optionally, the temperature sensing unit is connected with the heating unit, a jet pump and a high-temperature filter are arranged in the heating unit, and one side of the high-temperature filter is connected with the high-temperature electric ball valve.
Optionally, the calibration unit includes an electromagnetic valve, and one side of the electromagnetic valve is connected with the analyzer.
Optionally, the back-blowing gas path unit comprises a sampler, a filter is arranged in the sampler, and the lower end of the sampler is connected with a purging electromagnetic valve.
Optionally, the refrigeration unit includes an analyzer module housing, one side of which is provided with a scroll refrigeration tube.
Optionally, the output end of the high-temperature pretreatment unit is connected with the calibration unit, the output end of the calibration unit is respectively connected with the back flushing unit and the analysis unit, the output end of the analysis unit is connected with the refrigeration unit, and the output end of the electric control unit is respectively connected with the calibration unit, the back flushing air circuit unit, the analysis unit and the refrigeration unit.
The embodiment of the utility model has the following beneficial effects:
in one embodiment of the utility model, the high-temperature pretreatment unit is arranged on the upper layer structure of the system cabinet, the high-temperature pretreatment unit adopts a high-temperature extraction hot wet method to extract, sample and measure the sample gas in the chimney, in the monitoring process, in order to avoid generating ammonium salt, the whole pipeline of the whole sample gas extraction high-temperature pretreatment unit is controlled at 180-210 ℃, so that the components are ensured to be analyzed and measured at the same working condition temperature, the pipeline blockage caused by ammonium salt crystallization is avoided, sampling is carried out through the jet pump, the conventional air pump can not work for a long time at high temperature, the problem of high-temperature down-sampling is solved, the sampler adopts a titanium alloy metal filter, the high-temperature resistance and the corrosion resistance are realized, a system cabinet is provided with two-stage filtration, the cleanness of sample gas for measurement is guaranteed, the lower layer structure is provided with a calibration unit and a back-blowing gas circuit unit, and the calibration and the verification can be carried out on an ammonia analysis unit at regular time.
Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic block diagram of an embodiment of the present invention;
fig. 2 is a schematic view of a system flow structure according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the utility model have been omitted.
Referring to fig. 1-2, in the present embodiment, an ammonia slip online monitoring system by a high temperature extraction method is provided, which includes: the system cabinet is provided with an upper layer structure and a lower layer structure, and suspension separation treatment is performed between the upper layer structure and the lower layer structure;
the upper layer structure is internally provided with a high-temperature pretreatment unit, the high-temperature pretreatment unit is internally provided with a high-temperature electric ball valve, a jet pump, a high-temperature filter, a heating unit and a temperature sensor, and the lower layer structure comprises a calibration unit, a back-flushing gas circuit unit, an electric control unit, an analysis unit and a refrigeration unit.
The application of one aspect of the embodiment is as follows: when the on-line monitoring system for ammonia escape by using a high-temperature extraction method is used, firstly, a temperature sensor transmits the received temperature to a heating unit, the heating unit controls the whole pipeline to be 180-210 ℃, an electric control unit starts a high-temperature pretreatment unit to extract the smoke of a chimney, then the smoke is subjected to secondary filtration by a high-temperature filter, then the electric control unit starts a back-blowing gas path unit, the back-blowing gas path unit purges the surface of a sampling gas filter element and a sampling pipe to ensure that the surface of the filter element and the sampling pipe are clean, then, when the calibration is carried out by a calibration unit, a high-temperature electric ball valve closes a sampling gas path, then the electric control unit controls the opening of each shunt electromagnetic valve to enable calibration gas to enter an analyzer to carry out instrument calibration, then the calibrated tail gas enters an air inlet of a jet pump to be ejected out, then, the electric control unit controls a refrigeration unit to generate refrigeration gas through a vortex refrigeration pipe to carry out refrigeration and temperature control treatment on an analyzer module box body, the analyzer light source circuit part is ensured to work below 50 ℃, thereby completing the use of the ammonia escape on-line monitoring system by the high-temperature extraction method. It should be noted that all the electric devices referred to in this application may be powered by a storage battery or an external power source.
The upper layer structure of the system cabinet is provided with the high-temperature pretreatment unit, the high-temperature pretreatment unit adopts a high-temperature extraction hot wet method, sample gas in a chimney is extracted, sampled and measured, in order to avoid generating ammonium salt in the monitoring process, the whole pipeline of the whole sample gas extraction high-temperature pretreatment unit is controlled to be 180-210 ℃, the analysis and measurement of components at the same working condition temperature are ensured, the pipeline blockage caused by ammonium salt crystallization is avoided, the sampling is carried out through a jet pump, the conventional air pump cannot work at high temperature for a long time, the problem of high-temperature sampling is solved, the sampler adopts a titanium alloy metal filter, the sampler is high-temperature resistant and corrosion resistant, the system cabinet is provided with two-stage filtering, the cleanness of the measured sample gas is ensured, the lower layer structure is provided with the calibration unit and the back-flushing unit, and the ammonia gas path analysis unit can be calibrated and checked regularly.
The temperature sensing unit of this embodiment is connected with the heating unit, is provided with jet pump, high temperature filter in the heating unit, and one side of high temperature filter is connected with the electronic ball valve of high temperature. The flow of a jet pump is controlled by (0.4-0.7) MPa compressed gas through the gas output of a regulating throttle valve, the jet pump forms negative pressure under the power of high-pressure gas, smoke of a chimney passes through a high-temperature sampler (heating temperature is 190 ℃) to be extracted, a titanium alloy metal filter with high precision of 1 mu m is arranged in the sampler to perform primary filtration, the smoke enters a special high-temperature heat tracing pipe (190 ℃) through a gas outlet of the sampler to enter a system high-temperature pretreatment box, a heating block arranged in the high-temperature pretreatment box is heated to 190 ℃ and 210 ℃, the smoke enters a box body and then is subjected to high-temperature filtration (0.5 mu m), secondary filtration is performed, the filtered smoke enters a high-temperature electric ball valve and then enters an analysis unit to be measured, the inner cavity of the analysis unit is heated to 190 ℃ in the whole process, and the measured waste gas enters an air inlet of the jet pump to be sprayed out.
The calibration unit of this embodiment includes the solenoid valve, and one side of solenoid valve is connected with the analysis appearance. When air zero calibration and standard gas flow calibration are carried out, the high-temperature electric ball valve closes a sampling gas circuit, the opening of each shunt electromagnetic valve is controlled by the electric control unit, calibration gas enters the analysis unit to carry out instrument calibration and calibration, and the calibrated tail gas enters the air inlet of the jet pump to be discharged.
The back-blowing gas circuit unit of this embodiment includes the sample thief, is provided with the filter in the sample thief, and the lower extreme of sample thief is connected with the solenoid valve that sweeps. In the long-time working process of the sampler, particles in smoke are easy to accumulate in the sampler, excessive particles adsorbed on the surface of a filter of the sampler are easy to reduce the sampling flow, so that a cabinet of the system is provided with a back-blowing gas path unit, compressed air is subjected to oil-water separation through a pressure regulating filter and is regulated to (0.4-0.7) MPa, the system closes a sampling gas path, a purging electromagnetic valve at the lower end of the sampler is opened to purge the surface of a filter element and a sampling pipe of the sampling gas, and an electric control unit automatically purges the sampling gas once through program control for 1-2 hours, so that the surface cleaning of the filter element and the cleaning of the sampling pipe are ensured.
The refrigeration unit of this embodiment includes the analysis appearance module box, and one side of analysis appearance module box is provided with the vortex refrigeration pipe. The inside cavity of ammonia analysis unit heats 190 ℃, has avoided ammonium salt crystallization in the analysis unit measuring cell to lead to the mirror surface pollution, and analysis unit light source circuit part will guarantee to work below 50 ℃ simultaneously, consequently adopts vortex refrigeration pipe to produce refrigerating gas and carries out refrigeration accuse temperature to analysis appearance module box and handle, adopts vortex refrigeration pipe to refrigerate, low cost, and it is convenient to maintain.
The output end of the high-temperature pretreatment unit of this embodiment is connected with the calibration unit, the output end of the calibration unit is connected with the back-flushing unit and the analysis unit respectively, the output end of the analysis unit is connected with the refrigeration unit, and the output end of the electric control unit is connected with the calibration unit, the back-flushing air circuit unit, the analysis unit and the refrigeration unit respectively. The electronic control unit is used for controlling the use of each unit.
Specifically, all pipelines of the system are stainless steel 316L pipelines, and the electromagnetic valves are made of stainless steel materials.
The above embodiments may be combined with each other.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Claims (4)
1. The utility model provides a high temperature extraction method ammonia escape on-line monitoring system which characterized in that includes: the system cabinet is provided with an upper layer structure and a lower layer structure;
the upper layer structure is internally provided with a high-temperature pretreatment unit, the high-temperature pretreatment unit is internally provided with a high-temperature electric ball valve, a jet pump, a high-temperature filter, a heating unit and a temperature sensor, and the lower layer structure comprises a calibration unit, a back-flushing gas circuit unit, an electric control unit, an analysis unit and a refrigeration unit;
the calibration unit comprises an electromagnetic valve, one side of the electromagnetic valve is connected with an analyzer, the back-blowing gas circuit unit comprises a sampler, a filter is arranged in the sampler, and the lower end of the sampler is connected with a purging electromagnetic valve.
2. The system as claimed in claim 1, wherein the temperature sensing unit is connected with the heating unit, the heating unit is provided with a jet pump and a high temperature filter, and one side of the high temperature filter is connected with a high temperature electric ball valve.
3. The system as claimed in claim 1, wherein the refrigeration unit comprises an analyzer module case, and a vortex refrigeration pipe is arranged at one side of the analyzer module case.
4. The on-line monitoring system for ammonia escape in high temperature extraction method as recited in claim 1, wherein the output end of the high temperature pretreatment unit is connected with the calibration unit, the output end of the calibration unit is connected with the back flushing unit and the analysis unit, respectively, the output end of the analysis unit is connected with the refrigeration unit, and the output end of the electric control unit is connected with the calibration unit, the back flushing gas path unit, the analysis unit and the refrigeration unit, respectively.
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| CN202120834145.7U CN215492692U (en) | 2021-04-22 | 2021-04-22 | High-temperature extraction method ammonia escape on-line monitoring system |
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| CN202120834145.7U CN215492692U (en) | 2021-04-22 | 2021-04-22 | High-temperature extraction method ammonia escape on-line monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115615954A (en) * | 2022-12-20 | 2023-01-17 | 合肥金星智控科技股份有限公司 | TDLAS-based ammonia gas online monitoring assembly, monitoring system and monitoring method |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115615954A (en) * | 2022-12-20 | 2023-01-17 | 合肥金星智控科技股份有限公司 | TDLAS-based ammonia gas online monitoring assembly, monitoring system and monitoring method |
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